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btrfs-progs: fix overflow in btrfs_scan_one_dir() 

btrfs_scan_one_dir() can overflow an arbitrarily small 256 byte buffer
with an arbitrarily slightly larger 1024 byte buffer as it remembers the
path of a dir to later descend.

Make these buffers the same size to stop the overflow and chose PATH_MAX
for that size so that it won't fail on legitimately bonkers paths.

Signed-off-by: Zach Brown <zab@redhat.com>
master
Zach Brown 2013-01-23 11:31:24 -08:00
parent 506fb87fe4
commit de763395fb
1 changed files with 4 additions and 6 deletions
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10
utils.c
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@ -922,7 +922,7 @@ int get_mountpt(char *dev, char *mntpt, size_t size)
struct pending_dir {
struct list_head list;
char name[256];
char name[PATH_MAX];
};
void btrfs_register_one_device(char *fname)
@ -958,7 +958,6 @@ int btrfs_scan_one_dir(char *dirname, int run_ioctl)
int ret;
int fd;
int dirname_len;
int pathlen;
char *fullpath;
struct list_head pending_list;
struct btrfs_fs_devices *tmp_devices;
@ -973,8 +972,7 @@ int btrfs_scan_one_dir(char *dirname, int run_ioctl)
again:
dirname_len = strlen(pending->name);
pathlen = 1024;
fullpath = malloc(pathlen);
fullpath = malloc(PATH_MAX);
dirname = pending->name;
if (!fullpath) {
@ -993,11 +991,11 @@ again:
break;
if (dirent->d_name[0] == '.')
continue;
if (dirname_len + strlen(dirent->d_name) + 2 > pathlen) {
if (dirname_len + strlen(dirent->d_name) + 2 > PATH_MAX) {
ret = -EFAULT;
goto fail;
}
snprintf(fullpath, pathlen, "%s/%s", dirname, dirent->d_name);
snprintf(fullpath, PATH_MAX, "%s/%s", dirname, dirent->d_name);
ret = lstat(fullpath, &st);
if (ret < 0) {
fprintf(stderr, "failed to stat %s\n", fullpath);